{"id":14329,"date":"2023-09-14T09:49:15","date_gmt":"2023-09-14T15:49:15","guid":{"rendered":"https:\/\/limblecmms.com\/?page_id=14329"},"modified":"2025-03-25T11:47:33","modified_gmt":"2025-03-25T17:47:33","slug":"fault-tolerance","status":"publish","type":"page","link":"https:\/\/limblecmms.com\/learn\/definitions\/fault-tolerance\/","title":{"rendered":"Fault Tolerance"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row full_width=&#8221;stretch_row&#8221; kd_background_image_position=&#8221;vc_row-bg-position-top&#8221; css=&#8221;.vc_custom_1686168792651{background: #152232 url(https:\/\/limblecmms.com\/wp-content\/uploads\/blog-header-hex-bg4.webp?id=9266) !important;background-position: 0 0 !important;background-repeat: no-repeat !important;}&#8221;][vc_column width=&#8221;1\/2&#8243; css=&#8221;.vc_custom_1683307506642{padding-bottom: 80px !important;}&#8221;]<header class=\"kd-section-title col-lg-8 vc_col-sm-8 text-center  subtitle-below-title    vc_custom_1702669043807\" ><h1 class=\"separator_off\" style=\"color: #ffffff;font-size: 50;\">Fault Tolerance<\/h1><h2 class=\"subtitle\" style=\"color: #ffffff;font-size:15px;\">Learn how fault-tolerant systems help optimize equipment reliability and availability for manufacturers.<\/h2><\/header><a  href=\"https:\/\/limblecmms.com\/resources\/cmms-buyers-guide\/\"  target=\"_self\"  title=\"\"  class=\"tt_button tt_primary_button btn_primary_color  button-center button-action-link   vc_custom_1742924841979\" ><span class=\"prim_text\">Free CMMS Buyer's Guide<\/span><\/a>\n      <div class=\"entry-meta\">\n         <span class=\"published\">\n            <span class=\"far fa-clock\" aria-hidden=\"true\"><\/span>Last updated on March 25, 2025<\/span>\n            <span class=\"author\"><span class=\"far sway-author-meta\" aria-hidden=\"true\"><\/span>\n            <span>bBrinton<\/span>\n         <\/span>\n      <\/div>\n\n   [\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_video link=&#8221;https:\/\/www.youtube.com\/watch?v=sOfzB-W0ZdA&#8221; align=&#8221;right&#8221; el_class=&#8221;video-shadow&#8221;][\/vc_column][\/vc_row][vc_row kd_background_image_position=&#8221;vc_row-bg-position-top&#8221; css=&#8221;.vc_custom_1687442797424{margin-top: 40px !important;}&#8221; el_class=&#8221;limble-page-blog-width&#8221;][vc_column][vc_column_text]<\/p>\n<h2>What is fault tolerance?<\/h2>\n<p><span style=\"font-weight: 400;\">Fault tolerance<\/span><span style=\"font-weight: 400;\"> is a <\/span><span style=\"font-weight: 400;\">system&#8217;s ability<\/span><span style=\"font-weight: 400;\"> to continue normal operations in the event of failures or malfunctions. These malfunctions may include <\/span><span style=\"font-weight: 400;\">power outages<\/span><span style=\"font-weight: 400;\">, technical glitches, and even potentially catastrophic <\/span><span style=\"font-weight: 400;\">system failures<\/span><span style=\"font-weight: 400;\">.<\/span>[\/vc_column_text][\/vc_column][\/vc_row][vc_row kd_background_image_position=&#8221;vc_row-bg-position-top&#8221; css=&#8221;.vc_custom_1687442797424{margin-top: 40px !important;}&#8221; el_class=&#8221;limble-page-blog-width&#8221;][vc_column][vc_column_text]<\/p>\n<h2><span style=\"font-weight: 400;\">Table of Contents<\/span><\/h2>\n<p><a href=\"#process\"><span style=\"font-weight: 400;\">Why are fault-tolerant systems important?<\/span><\/a><br \/>\n<a href=\"#types\">Fault-tolerant systems vs. highly available systems<\/a><br \/>\n<a href=\"#effort\">Different levels of fault tolerance<\/a><br \/>\n<a href=\"#fault\">Fault tolerance techniques<\/a><br \/>\n<a href=\"#components\">Components of a fault-tolerant system<\/a><br \/>\n<a href=\"#last\">Fault tolerance and maintenance operations<\/a>[\/vc_column_text][\/vc_column][\/vc_row][vc_row kd_background_image_position=&#8221;vc_row-bg-position-top&#8221; css=&#8221;.vc_custom_1687440273251{margin-top: 40px !important;}&#8221; el_class=&#8221;limble-page-blog-width&#8221;][vc_column][vc_column_text]<\/p>\n<h2 id=\"process\">Why are fault-tolerant systems important?<\/h2>\n<p><span style=\"font-weight: 400;\">The various approaches to <\/span><span style=\"font-weight: 400;\">fault tolerance<\/span><span style=\"font-weight: 400;\"> all help organizations avoid the consequences of a <\/span><span style=\"font-weight: 400;\">single point of failure<\/span><span style=\"font-weight: 400;\">. Additional benefits of improving <\/span><span style=\"font-weight: 400;\">fault tolerance<\/span><span style=\"font-weight: 400;\"> across your organization may include:\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Increased reliability<\/b><span style=\"font-weight: 400;\">: By reducing the likelihood and potential impact of <\/span><span style=\"font-weight: 400;\">system failures<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">fault tolerance<\/span><span style=\"font-weight: 400;\"> boosts the <\/span><a href=\"https:\/\/limblecmms.com\/blog\/equipment-reliability\/\"><span style=\"font-weight: 400;\">reliability<\/span><\/a><span style=\"font-weight: 400;\"> of your assets.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Reduced <\/b><b>downtime<\/b><span style=\"font-weight: 400;\">: Automated fault detection and recovery systems ensure that backup resources can be used to reduce unexpected <\/span><a href=\"https:\/\/limblecmms.com\/maintenance-definitions\/downtime\/\"><span style=\"font-weight: 400;\">downtime<\/span><\/a><span style=\"font-weight: 400;\"> and minimize its direct and indirect costs.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>More secure data<\/b><span style=\"font-weight: 400;\">: <\/span><span style=\"font-weight: 400;\">Fault-tolerant systems<\/span><span style=\"font-weight: 400;\"> can eliminate the risk of <\/span><span style=\"font-weight: 400;\">critical data loss<\/span><span style=\"font-weight: 400;\"> or corruption by storing crucial information in backup locations and responding in the event of data breaches or <\/span><span style=\"font-weight: 400;\">hardware failures<\/span><span style=\"font-weight: 400;\">.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Enhanced performance<\/b><span style=\"font-weight: 400;\">: Ensuring <\/span><span style=\"font-weight: 400;\">workloads<\/span><span style=\"font-weight: 400;\"> are distributed for maximum efficiency, <\/span><span style=\"font-weight: 400;\">fault-tolerant systems<\/span><span style=\"font-weight: 400;\"> can reduce bottlenecks to improve <\/span><span style=\"font-weight: 400;\">overall system performance<\/span><span style=\"font-weight: 400;\">.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">F<\/span><span style=\"font-weight: 400;\">ault-tolerant systems<\/span><span style=\"font-weight: 400;\"> contribute to a more resilient organization and play an important role in <\/span><span style=\"font-weight: 400;\">business continuity<\/span><span style=\"font-weight: 400;\"> as a whole. <\/span>[\/vc_column_text][\/vc_column][\/vc_row][vc_row content_placement=&#8221;middle&#8221; kd_background_image_position=&#8221;vc_row-bg-position-bottom&#8221; kd_top_separator_style=&#8221;skew-left&#8221; kd_top_separator_height=&#8221;separator-height-small&#8221; kd_bottom_separator_style=&#8221;skew-left&#8221; kd_bottom_separator_height=&#8221;separator-height-small&#8221; kd_top_separator=&#8221;true&#8221; kd_bottom_separator=&#8221;true&#8221; css=&#8221;.vc_custom_1699568177111{margin-bottom: 40px !important;padding-top: 120px !important;padding-right: 40px !important;padding-bottom: 50px !important;padding-left: 40px !important;background: #dde4e8 url(https:\/\/limblecmms.com\/wp-content\/uploads\/cta-laired-hex-4.webp?id=9077) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;border-radius: 0px !important;}&#8221; css_tablet_landscape=&#8221;.vc_custom_1699568177111{padding-bottom: 80px !important;}&#8221; css_tablet_portrait=&#8221;.vc_custom_1699568177112{padding-bottom: 80px !important;}&#8221; css_mobile=&#8221;.vc_custom_1699568177112{padding-bottom: 80px !important;}&#8221; el_class=&#8221;limble-page-blog-width&#8221;][vc_column][vc_row_inner kd_background_image_position=&#8221;vc_row-bg-position-top&#8221;][vc_column_inner]<header class=\"kd-section-title col-lg-12 text-center  subtitle-below-title kd-animated fadeIn   vc_custom_1687971311556\" data-animation-delay=200><h2 class=\"separator_off\" style=\"font-size: 42px;font-weight: 500;margin-bottom:30px;\">The Essential Guide to CMMS<\/h2><h6 class=\"subtitle\" style=\"color: #152232;\">Download this helpful guide to everything a CMMS has to offer.<\/h6><\/header>[\/vc_column_inner][\/vc_row_inner][vc_row_inner content_placement=&#8221;top&#8221; kd_background_image_position=&#8221;vc_row-bg-position-top&#8221;][vc_column_inner width=&#8221;1\/2&#8243; css=&#8221;.vc_custom_1631866454223{padding-right: 50px !important;padding-left: 0px !important;}&#8221; offset=&#8221;vc_col-lg-6 vc_col-md-12 vc_col-xs-12&#8243; css_tablet_landscape=&#8221;.vc_custom_1631866454223{padding-right: 0px !important;}&#8221; css_tablet_portrait=&#8221;.vc_custom_1631866454223{padding-right: 0px !important;}&#8221; css_mobile=&#8221;.vc_custom_1631866454224{padding-right: 15px !important;}&#8221;][vc_raw_html]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[\/vc_raw_html][\/vc_column_inner][vc_column_inner width=&#8221;1\/2&#8243;][vc_single_image source=&#8221;external_link&#8221; alignment=&#8221;center&#8221; css_animation=&#8221;fadeIn&#8221; custom_src=&#8221;https:\/\/3975608.fs1.hubspotusercontent-na1.net\/hubfs\/3975608\/Content%20Downloads\/CMMS%20Guide%20mockup.png&#8221;][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row kd_background_image_position=&#8221;vc_row-bg-position-top&#8221; css=&#8221;.vc_custom_1687440273251{margin-top: 40px !important;}&#8221; el_class=&#8221;limble-page-blog-width&#8221;][vc_column][vc_column_text]<\/p>\n<h2 id=\"types\">Fault-tolerant systems vs. highly available systems<\/h2>\n<p><a href=\"https:\/\/www.spiceworks.com\/it-security\/vulnerability-management\/articles\/high-availability-fault-tolerance-comparison\/\"><span style=\"font-weight: 400;\">Availability and <\/span><span style=\"font-weight: 400;\">fault tolerance<\/span><\/a><span style=\"font-weight: 400;\"> are both ways to make systems more reliable, maximize <\/span><span style=\"font-weight: 400;\">uptime<\/span><span style=\"font-weight: 400;\">, and achieve <\/span><span style=\"font-weight: 400;\">business continuity<\/span><span style=\"font-weight: 400;\">. The key difference between the two is that <\/span><span style=\"font-weight: 400;\">fault tolerance<\/span><span style=\"font-weight: 400;\"> eliminates the possibility of <\/span><span style=\"font-weight: 400;\">service interruption<\/span><span style=\"font-weight: 400;\"> altogether. Even assets with 99.999% availability (sometimes referred to as five <\/span><span style=\"font-weight: 400;\">nines<\/span><span style=\"font-weight: 400;\">-class equipment) will experience <\/span><i><span style=\"font-weight: 400;\">some<\/span><\/i> <span style=\"font-weight: 400;\">downtime<\/span><span style=\"font-weight: 400;\"> each production cycle.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Do you need <\/span><span style=\"font-weight: 400;\">fault-tolerant systems<\/span><span style=\"font-weight: 400;\">?\u00a0<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">In some instances, systems require <\/span><span style=\"font-weight: 400;\">fault-tolerant designs<\/span><span style=\"font-weight: 400;\"> to <\/span><span style=\"font-weight: 400;\">function<\/span><span style=\"font-weight: 400;\"> as needed. For other systems, availability above a certain threshold will suffice. Whether you work toward <\/span><span style=\"font-weight: 400;\">fault tolerance<\/span><span style=\"font-weight: 400;\"> or strive for <\/span><span style=\"font-weight: 400;\">high availability<\/span><span style=\"font-weight: 400;\"> for a particular system will depend on your answers to these questions:\u00a0<\/span><\/p>\n<ul>\n<li><b>How important is the component or system? <\/b><span style=\"font-weight: 400;\">If a given component or system is not critical to your organization\u2019s normal operations, you may not need to make an investment in <\/span><span style=\"font-weight: 400;\">fault tolerance<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/li>\n<li aria-level=\"1\"><b>How likely is it that this component or system will fail? <\/b><span style=\"font-weight: 400;\">Fault tolerance systems<\/span><span style=\"font-weight: 400;\"> are generally unnecessary in instances where failure is extremely unlikely.<\/span><\/li>\n<li aria-level=\"1\"><a href=\"https:\/\/limblecmms.com\/blog\/how-technology-reduces-maintenance-costs\/\"><b>How much will it cost<\/b><\/a><b> to make a component or system <\/b><b>fault-tolerant<\/b><b>? <\/b>Even when critical systems are vulnerable to failure, investing in fault tolerance is not always cost-effective.<\/li>\n<\/ul>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row kd_background_image_position=&#8221;vc_row-bg-position-top&#8221; css=&#8221;.vc_custom_1687440273251{margin-top: 40px !important;}&#8221; el_class=&#8221;limble-page-blog-width&#8221;][vc_column][vc_column_text]<\/p>\n<h2 id=\"effort\">Different levels of fault tolerance<\/h2>\n<p><span style=\"font-weight: 400;\">Though <\/span><span style=\"font-weight: 400;\">fault tolerance<\/span><span style=\"font-weight: 400;\"> is not typically measured with a percentage like availability, <\/span><span style=\"font-weight: 400;\">fault-tolerant systems<\/span><span style=\"font-weight: 400;\"> can offer different levels of protection against <\/span><span style=\"font-weight: 400;\">disruptions<\/span><span style=\"font-weight: 400;\">.\u00a0\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The simplest type of <\/span><span style=\"font-weight: 400;\">fault-tolerant<\/span><span style=\"font-weight: 400;\"> technologies allow businesses to <\/span><span style=\"font-weight: 400;\">function<\/span><span style=\"font-weight: 400;\"> in the event of power failures.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">At the next level, systems are capable of instantly switching to <\/span><span style=\"font-weight: 400;\">backup components<\/span><span style=\"font-weight: 400;\"> in response to failures.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">High-level <\/span><span style=\"font-weight: 400;\">fault tolerance<\/span><span style=\"font-weight: 400;\"> involves the use of numerous sensors or systems to continuously assess for signs of a fault or failure\u00a0 and trigger a corrective response.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Fault-tolerant<\/span><span style=\"font-weight: 400;\"> technology and redundancies may be built directly into processes and systems, automatically triggering backups when needed to provide the highest level of protection.\u00a0<\/span><\/li>\n<\/ul>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row kd_background_image_position=&#8221;vc_row-bg-position-top&#8221; css=&#8221;.vc_custom_1687440273251{margin-top: 40px !important;}&#8221; el_class=&#8221;limble-page-blog-width&#8221;][vc_column][vc_column_text]<\/p>\n<h2 id=\"fault\">Fault tolerance techniques<\/h2>\n<p><span style=\"font-weight: 400;\">A number of techniques help improve a system\u2019s level of <\/span><span style=\"font-weight: 400;\">fault-tolerance and<\/span><span style=\"font-weight: 400;\"> maintain <\/span><span style=\"font-weight: 400;\">continuous operations<\/span><span style=\"font-weight: 400;\"> in spite of one or more <\/span><span style=\"font-weight: 400;\">failed components<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Redundancy<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Redundancy<\/span><span style=\"font-weight: 400;\">-based <\/span><span style=\"font-weight: 400;\">fault tolerance<\/span><span style=\"font-weight: 400;\"> involves duplication\u00a0 of <\/span><span style=\"font-weight: 400;\">mission-critical equipment<\/span><span style=\"font-weight: 400;\">, systems, or components to provide protection against failure.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">An <\/span><b>active <\/b><b>redundancy<\/b><span style=\"font-weight: 400;\"> uses multiple pieces of equipment that operate simultaneously. In the event that one piece of equipment fails, the other can make up the difference.\u00a0<\/span><\/p>\n<p><b>Passive <\/b><b>redundancies<\/b><span style=\"font-weight: 400;\"> involve <\/span><span style=\"font-weight: 400;\">backup components<\/span><span style=\"font-weight: 400;\"> that only become operational once primary equipment fails. You\u2019ll encounter two distinct types of passive <\/span><span style=\"font-weight: 400;\">redundancy<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Operating passive <\/span><span style=\"font-weight: 400;\">redundancies<\/span><span style=\"font-weight: 400;\">: These involve equipment that is waiting on standby as a hot spare. The <\/span><span style=\"font-weight: 400;\">redundant component<\/span><span style=\"font-weight: 400;\"> may operate under no-load conditions or serve a different <\/span><span style=\"font-weight: 400;\">function<\/span><span style=\"font-weight: 400;\"> than the primary equipment. If the primary equipment fails, the standby equipment transitions to take over its <\/span><span style=\"font-weight: 400;\">function<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Non-operating passive <\/span><span style=\"font-weight: 400;\">redundancies<\/span><span style=\"font-weight: 400;\">: These <\/span><span style=\"font-weight: 400;\">backup components<\/span><span style=\"font-weight: 400;\"> are powered down until they need to replace the primary piece of equipment. <\/span><span style=\"font-weight: 400;\">Redundancies<\/span><span style=\"font-weight: 400;\"> may go into operation automatically upon the failure of the primary system or require manual intervention.\u00a0<\/span><\/li>\n<\/ol>\n<h3><span style=\"font-weight: 400;\">Replication<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Replication<\/span><span style=\"font-weight: 400;\">-based <\/span><span style=\"font-weight: 400;\">fault tolerance<\/span><span style=\"font-weight: 400;\"> entails copying data to multiple systems. This promotes continuity in the event of a <\/span><span style=\"font-weight: 400;\">node<\/span><span style=\"font-weight: 400;\"> failure. The higher the degree of <\/span><span style=\"font-weight: 400;\">replication<\/span><span style=\"font-weight: 400;\">, the more <\/span><span style=\"font-weight: 400;\">fault tolerance<\/span><span style=\"font-weight: 400;\"> the system <\/span><span style=\"font-weight: 400;\">has<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Diversity<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Diversity-related techniques for improving <\/span><span style=\"font-weight: 400;\">fault tolerance<\/span><span style=\"font-weight: 400;\"> involve introducing new hardware, software, or network components into a system to make it more resilient. Leveraging a range of hardware vendors and selecting software written in multiple languages, for example, can improve diversity to mitigate the risk of failure.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Load balancing<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">A <\/span><span style=\"font-weight: 400;\">load balancing<\/span><span style=\"font-weight: 400;\"> technique for improving <\/span><span style=\"font-weight: 400;\">fault tolerance<\/span><span style=\"font-weight: 400;\"> involves distributing your organization\u2019s <\/span><span style=\"font-weight: 400;\">workloads<\/span><span style=\"font-weight: 400;\"> across numerous pieces of equipment. This allows activity to be spread across alternate production lines to maintain functionality in the event one line experiences a failure.\u00a0<\/span>[\/vc_column_text][\/vc_column][\/vc_row][vc_row kd_background_image_position=&#8221;vc_row-bg-position-top&#8221; css=&#8221;.vc_custom_1687440273251{margin-top: 40px !important;}&#8221; el_class=&#8221;limble-page-blog-width&#8221;][vc_column][vc_column_text]<\/p>\n<h2 id=\"components\">Components of a fault-tolerant system<\/h2>\n<p><span style=\"font-weight: 400;\">Developing a <\/span><span style=\"font-weight: 400;\">fault-tolerant system<\/span><span style=\"font-weight: 400;\"> requires effort at each stage in the equipment life cycle. Depending on its sophistication, the system may include some or all of the following components for detecting and responding to failures:\u00a0<\/span><b><\/b><\/p>\n<ul>\n<li aria-level=\"1\"><b>Fault detection and display<\/b><\/li>\n<li aria-level=\"1\"><b>Fault diagnosis and containment<\/b><\/li>\n<li aria-level=\"1\"><b>Fault masking and compensation<\/b><\/li>\n<\/ul>\n<h3><span style=\"font-weight: 400;\">Fault detection and display<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Fault detection refers to a <\/span><span style=\"font-weight: 400;\">system\u2019s ability<\/span><span style=\"font-weight: 400;\"> to sense a fault and alert the appropriate individuals. <\/span><b>This is the fundamental feature of any <\/b><b>fault-tolerant system<\/b><span style=\"font-weight: 400;\">. All other components depend on the effectiveness of the fault detection process.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For example, a sensor in a tire pressure monitoring system (TPMS) can detect over- or under-filled tires and promptly alert the driver via the car\u2019s dashboard. Detection and display is the acceptable tolerance level for this type of fault event. There is no automatic correction for the situation.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Fault diagnosis and containment<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">For more sophisticated systems and equipment, additional protections that trigger containment measures are included as part of the design. For example, a Distributed Control System (DCS) both monitors parameters through a set of sensors <\/span><i><span style=\"font-weight: 400;\">and <\/span><\/i><span style=\"font-weight: 400;\">performs diagnoses to locate and contain faults.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Imagine a pressure sensor within a system that detects petroleum products inside a vessel which are dangerously close to igniting or exploding. These sensors can trigger a pressure valve to activate and divert the high-pressure vapor to an exhaust stack.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Fault masking and compensation<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Masking faults is often a useful technique for protecting equipment that can be monitored or controlled through Internet of Things (IoT) technology. Cybersecurity attacks pose a constant threat for these types of equipment. An attacker may attempt to introduce a fault by injecting false data into the system.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Incorrect data could mean that the control and monitoring systems designed to protect the equipment actually begin causing it to fail. Alternatively, false data may trick a system into believing that faulty assets are in normal working condition. Over time, the assets will deteriorate without triggering the appropriate alerts.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-4812 aligncenter\" src=\"https:\/\/limblecmms.com\/wp-content\/uploads\/representation-of-SCADA-system-300x147.png\" alt=\"representation of SCADA system\" width=\"500\" height=\"245\" srcset=\"https:\/\/limblecmms.com\/wp-content\/uploads\/representation-of-SCADA-system-300x147.png 300w, https:\/\/limblecmms.com\/wp-content\/uploads\/representation-of-SCADA-system-451x220.png 451w, https:\/\/limblecmms.com\/wp-content\/uploads\/representation-of-SCADA-system-554x271.png 554w, https:\/\/limblecmms.com\/wp-content\/uploads\/representation-of-SCADA-system-93x45.png 93w, https:\/\/limblecmms.com\/wp-content\/uploads\/representation-of-SCADA-system-540x264.png 540w, https:\/\/limblecmms.com\/wp-content\/uploads\/representation-of-SCADA-system-100x49.png 100w, https:\/\/limblecmms.com\/wp-content\/uploads\/representation-of-SCADA-system.png 624w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p style=\"text-align: center;\"><i><span style=\"font-weight: 400;\">An example of a SCADA system.<\/span><\/i><\/p>\n<p><span style=\"font-weight: 400;\">Fault-masking ensures systems are designed to recognize incorrect information. For example, the circuit breakers in electricity grids are often controlled and monitored via Supervisory Control and Data Acquisition (SCADA). These systems monitor voltage and frequency parameters to promote stability across the power network. If an attacker attempts to inject false data, the system\u2019s <\/span><span style=\"font-weight: 400;\">algorithms<\/span><span style=\"font-weight: 400;\"> will respond by introducing additional data that \u201cmasks\u201d the attacker\u2019s efforts and keeps the grid reliable.\u00a0<\/span>[\/vc_column_text][\/vc_column][\/vc_row][vc_row full_width=&#8221;stretch_row_content&#8221; content_placement=&#8221;top&#8221; css_animation=&#8221;fadeInDown&#8221; kd_background_image_position=&#8221;vc_row-bg-position-bottom&#8221; css=&#8221;.vc_custom_1691073586371{margin-top: 50px !important;margin-bottom: 20px !important;padding-top: 50px !important;padding-bottom: 50px !important;background-color: #f1f6f8 !important;background-position: 0 0 !important;background-repeat: no-repeat !important;}&#8221;][vc_column css=&#8221;.vc_custom_1691073594574{padding-right: 70px !important;padding-left: 70px !important;}&#8221;]<div class=\"kd-calltoaction\" >\n                <div class=\"container\">\n                  <div class=\"cta-text-container kd-animated fadeIn\" data-animation-delay=\"200\"><div class=\"cta-text\"><h3 >Want to see Limble in action? Get started for free today!<\/h3><\/div>\n                    <\/div>\n                    <div class=\"cta-btncontainer\"><a href=\"https:\/\/limblecmms.com\/get-started\/\"  title=\"\" class=\"tt_button tt_primary_button btn_primary_color  button-action-link icon_right kd-animated zoomIn\" data-animation-delay=\"200\">Start Free Trial<span class=\"fas fa-chevron-right iconita\" ><\/span><\/a><\/div>\n                <\/div>\n            <\/div>[\/vc_column][\/vc_row][vc_row kd_background_image_position=&#8221;vc_row-bg-position-top&#8221; el_class=&#8221;limble-page-blog-width&#8221;][vc_column][vc_column_text]<\/p>\n<h2 id=\"last\">Analyzing fault tolerance<\/h2>\n<p><span style=\"font-weight: 400;\">As an essential part of <\/span><a href=\"https:\/\/limblecmms.com\/blog\/reliability-engineering\/\"><span style=\"font-weight: 400;\">reliability engineering<\/span><\/a><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">fault tolerance<\/span><span style=\"font-weight: 400;\"> requires careful examinations of all possible failure sources. Well-known techniques for analyzing systems include <\/span><a href=\"https:\/\/limblecmms.com\/blog\/fmea-and-fmeca\/\"><span style=\"font-weight: 400;\">Failure Mode Effect Analysis<\/span><\/a><span style=\"font-weight: 400;\"> (which takes a bottom-up approach) and the <\/span><a href=\"https:\/\/limblecmms.com\/blog\/fault-tree-analysis\/\"><span style=\"font-weight: 400;\">Fault Tree Analysis<\/span><\/a><span style=\"font-weight: 400;\"> (which takes a top-down approach). More advanced methods like the Markov model analyze dependencies throughout the system to assess the probability of failures.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Introducing <\/span><a href=\"https:\/\/limblecmms.com\/cmms\/cmms-software\/\"><span style=\"font-weight: 400;\">CMMS software<\/span><\/a><span style=\"font-weight: 400;\"> to your team can help ensure they stay on top of corrective maintenance and develop systems that empower a more proactive approach to addressing faults across the organization.\u00a0<\/span>[\/vc_column_text][\/vc_column][\/vc_row][vc_row full_width=&#8221;stretch_row&#8221; kd_background_image_position=&#8221;vc_row-bg-position-top&#8221; css=&#8221;.vc_custom_1699568197337{padding-top: 100px !important;}&#8221; el_class=&#8221;limble-page-blog-width&#8221;][vc_column css=&#8221;.vc_custom_1515677064675{padding-right: 0px !important;padding-left: 0px !important;}&#8221;][vc_row_inner kd_background_image_position=&#8221;vc_row-bg-position-top&#8221;][vc_column_inner]<header class=\"kd-section-title vc_col-lg-6 vc_col-sm-8 text-center  subtitle-below-title kd-animated fadeIn   vc_custom_1679419307921\" data-animation-delay=200><h2 class=\"separator_off\" >Related Content<\/h2><h6 class=\"subtitle\" >Explore our blog for insightful articles, personal reflections and ideas that inspire action on the topics you care about.<\/h6><\/header>[\/vc_column_inner][\/vc_row_inner][vc_row_inner kd_background_image_position=&#8221;vc_row-bg-position-top&#8221; css=&#8221;.vc_custom_1541417551563{padding-bottom: 100px !important;}&#8221;][vc_column_inner width=&#8221;1\/3&#8243;]<div class=\"kd-photobox  \" ><a href=\"https:\/\/limblecmms.com\/blog\/maintenance-strategy\/\"  title=\"Read More\"><div class=\"photobox-img\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"700\" src=\"https:\/\/limblecmms.com\/wp-content\/uploads\/The-Ins-And-Outs-Of-A-Maintenance-Work-Request.jpg\" class=\"attachment-full\" alt=\"Maintenance Work Order Template\" title=\"The-Ins-And-Outs-Of-A-Maintenance-Work-Request\" srcset=\"https:\/\/limblecmms.com\/wp-content\/uploads\/The-Ins-And-Outs-Of-A-Maintenance-Work-Request.jpg 700w, https:\/\/limblecmms.com\/wp-content\/uploads\/The-Ins-And-Outs-Of-A-Maintenance-Work-Request-300x300.jpg 300w, https:\/\/limblecmms.com\/wp-content\/uploads\/The-Ins-And-Outs-Of-A-Maintenance-Work-Request-150x150.jpg 150w, https:\/\/limblecmms.com\/wp-content\/uploads\/The-Ins-And-Outs-Of-A-Maintenance-Work-Request-320x320.jpg 320w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/div><div class=\"phb-content text-left \">\n                  <h5 >Choosing Maintenance Strategy<\/h5>\n                  <p ><\/p><\/div><\/a><\/div>[\/vc_column_inner][vc_column_inner width=&#8221;1\/3&#8243;]<div class=\"kd-photobox  \" ><a href=\"https:\/\/limblecmms.com\/blog\/maintenance-strategy\/\"  title=\"Read More\"><div class=\"photobox-img\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"700\" src=\"https:\/\/limblecmms.com\/wp-content\/uploads\/Ultimate-Guide-To-Reliability-Centered-Maintenance.png\" class=\"attachment-full\" alt=\"reliability centered maintenance\" title=\"Ultimate Guide To Reliability Centered Maintenance\" srcset=\"https:\/\/limblecmms.com\/wp-content\/uploads\/Ultimate-Guide-To-Reliability-Centered-Maintenance.png 700w, https:\/\/limblecmms.com\/wp-content\/uploads\/Ultimate-Guide-To-Reliability-Centered-Maintenance-300x300.png 300w, https:\/\/limblecmms.com\/wp-content\/uploads\/Ultimate-Guide-To-Reliability-Centered-Maintenance-150x150.png 150w, https:\/\/limblecmms.com\/wp-content\/uploads\/Ultimate-Guide-To-Reliability-Centered-Maintenance-320x320.png 320w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/div><div class=\"phb-content text-left \">\n                  <h5 >5 Types of Maintenance Strategies<\/h5>\n                  <p ><\/p><\/div><\/a><\/div>[\/vc_column_inner][vc_column_inner width=&#8221;1\/3&#8243;]<div class=\"kd-photobox  \" ><a href=\"https:\/\/limblecmms.com\/maintenance-definitions\/proactive-maintenance\/\"  title=\"Read More\"><div class=\"photobox-img\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"700\" src=\"https:\/\/limblecmms.com\/wp-content\/uploads\/IIoT-Technology-Applications-for-Maintenance-and-Asset-Management.jpg\" class=\"attachment-full\" alt=\"iiot maintenance\" title=\"IIoT Technology Applications for Maintenance and Asset Management\" srcset=\"https:\/\/limblecmms.com\/wp-content\/uploads\/IIoT-Technology-Applications-for-Maintenance-and-Asset-Management.jpg 700w, https:\/\/limblecmms.com\/wp-content\/uploads\/IIoT-Technology-Applications-for-Maintenance-and-Asset-Management-300x300.jpg 300w, https:\/\/limblecmms.com\/wp-content\/uploads\/IIoT-Technology-Applications-for-Maintenance-and-Asset-Management-150x150.jpg 150w, https:\/\/limblecmms.com\/wp-content\/uploads\/IIoT-Technology-Applications-for-Maintenance-and-Asset-Management-320x320.jpg 320w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/div><div class=\"phb-content text-left \">\n                  <h5 >What is Proactive Maintenance?<\/h5>\n                  <p ><\/p><\/div><\/a><\/div>[\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row kd_background_image_position=&#8221;vc_row-bg-position-top&#8221;][vc_column][vc_raw_html]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[\/vc_raw_html][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row full_width=&#8221;stretch_row&#8221; kd_background_image_position=&#8221;vc_row-bg-position-top&#8221; css=&#8221;.vc_custom_1686168792651{background: #152232 url(https:\/\/limblecmms.com\/wp-content\/uploads\/blog-header-hex-bg4.webp?id=9266) !important;background-position: 0 0 !important;background-repeat: [&hellip;]<\/p>\n","protected":false},"author":77,"featured_media":0,"parent":10098,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"categories":[471],"tags":[],"class_list":["post-14329","page","type-page","status-publish","hentry","category-maintenance-definitions"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.7.1 (Yoast SEO v25.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is Fault Tolerance? | Limble CMMS<\/title>\n<meta name=\"description\" content=\"Everything manufacturers need to know about fault tolerance and how it helps improve 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